Brake Control Unit Yaw Rate Feedback Stabilization
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Solution Overview
Problem
Brake control systems face instability when intervened by external control units, leading to improper brake control and vehicle behavior issues due to unsynchronized braking signals.
Innovation Solution
A brake control unit that receives and processes braking signals from external control units, using estimated yaw rates and actual yaw rate measurements to determine the degree of intervention, with adjustable threshold values based on vehicle speed and straight driving indicators to stabilize vehicle motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If brake control signal from external control unit is received and applied, then brake control functionality is enhanced, but vehicle stability deteriorates due to unsynchronized braking signals
Solution Approach 1:
The brake control unit receives feedback from the yaw rate sensor about actual vehicle yaw rate and compares it with the expected yaw rate calculated from steering angle and vehicle speed. This feedback mechanism allows the system to detect when external brake control signals are causing vehicle instability and adjust or reject these signals accordingly, thus maintaining vehicle stability while preserving the ability to accept beneficial external control inputs.
Solution Approach 2:
The system dynamically adjusts its acceptance of external brake control signals based on real-time vehicle state. When the deviation between actual and expected yaw rate exceeds a threshold, the system transitions from accepting external signals to rejecting them, creating a dynamic response that maintains stability while allowing functional enhancement under normal conditions.
2Adaptability or versatility
If brake control signal from external control unit is received, then control versatility is improved, but vehicle behavior control precision deteriorates
Solution Approach 1:
The system uses feedback from the yaw rate sensor to continuously monitor actual vehicle behavior and compare it with expected behavior based on steering input. This precision feedback allows the system to detect deviations caused by external control signals and adjust the level of intervention or rejection to maintain precise vehicle behavior control.
Solution Approach 2:
The system calculates the expected yaw rate in advance based on steering angle and vehicle speed before external brake control signals are applied. This preliminary calculation establishes a reference for comparing actual vehicle response, enabling the system to detect and correct deviations before they significantly impact control precision.
3Productivity
If external brake control signal intervention is increased, then brake control capability is enhanced, but vehicle motion stability deteriorates
Solution Approach 1:
The system dynamically modulates the level of external brake control signal intervention based on real-time vehicle stability assessment. When vehicle motion remains within expected parameters, external signals are fully utilized for enhanced brake control capability. When instability is detected through yaw rate deviation, the system reduces or rejects external signals to maintain stability, creating a dynamic balance between capability and stability.
Solution Approach 2:
The yaw rate sensor provides continuous feedback about vehicle motion stability, allowing the system to monitor the effect of external brake control signals in real-time. This feedback enables the system to adjust the degree of external signal intervention to maintain stability while preserving brake control capability when conditions are favorable.
Data Source
AI summary
An ECU which includes a receiving portion that receives a control signal related to braking of a vehicle transmitted from an external ECU installed outside the ECU and a yaw rate estimation portion that estimates a yaw rate of the vehicle, based on a vehicle speed and steering angles which indicate turning angles of a steering wheel of the vehicle or turning angles of a wheel.